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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5296697861b31124165211db5e7971d630bed643b40c005b5b25a9c9488ed94' 
  AND token = 'Nb5uXVAzN18Iv/v51mfWG+an0Ci9P8EGfinIQNBrmGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}